/Engine/Source/Runtime/Engine/Classes/GameFramework/PlayerController.h
Returns hit results from doing a collision query at a certain location on the screen
bool GetHitResultAtScreenPosition ( const FVector2D ScreenPosition, const ECollisionChannel TraceChannel, const [FCollisionQueryParams](API\Runtime\Engine\FCollisionQueryParams) & CollisionQueryParams, [FHitResult](API\Runtime\Engine\Engine\FHitResult) & HitResult ) const